We’re not talking primarily about physical stamina here, although that’s part of it. In a lot of shops, the workload can grind people down if they aren’t strong enough to handle it. It’s important to let candidates know that a position will be demanding-as well as to see how they rate themselves in the fortitude department.
2: How hard have you been working lately?

Even the most industrious employees can lose the habit of working hard if they’ve been in a situation that doesn’t require it. And a candidate who’s fallen into “coasting” mode may have trouble ramping up for the effort you require. Conversely, a candidate who speaks enthusiastically about being engaged in challenging projects may well be a self-starter who could energize your team with his or her commitment and work ethic.